

#include <string.h>
#include "des.h"

//#ifndef _CRT_SECURE_NO_DEPRECATE
//#define _CRT_SECURE_NO_DEPRECATE 1
//#endif

typedef unsigned char UBYTE ;
typedef unsigned int ULONG ;
/*
* 32-bit integer manipulation macros (big endian)
*/
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n,b,i)                            \
	{                                                       \
	(n) = ( (unsigned long) (b)[(i)    ] << 24 )        \
	| ( (unsigned long) (b)[(i) + 1] << 16 )        \
	| ( (unsigned long) (b)[(i) + 2] <<  8 )        \
	| ( (unsigned long) (b)[(i) + 3]       );       \
	}
#endif

#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i)                            \
	{                                                       \
	(b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
	(b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
	(b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
	(b)[(i) + 3] = (unsigned char) ( (n)       );       \
	}
#endif

/*
* Expanded DES S-boxes
*/
static const unsigned long SB1[64] =
{
	0x01010400, 0x00000000, 0x00010000, 0x01010404,
	0x01010004, 0x00010404, 0x00000004, 0x00010000,
	0x00000400, 0x01010400, 0x01010404, 0x00000400,
	0x01000404, 0x01010004, 0x01000000, 0x00000004,
	0x00000404, 0x01000400, 0x01000400, 0x00010400,
	0x00010400, 0x01010000, 0x01010000, 0x01000404,
	0x00010004, 0x01000004, 0x01000004, 0x00010004,
	0x00000000, 0x00000404, 0x00010404, 0x01000000,
	0x00010000, 0x01010404, 0x00000004, 0x01010000,
	0x01010400, 0x01000000, 0x01000000, 0x00000400,
	0x01010004, 0x00010000, 0x00010400, 0x01000004,
	0x00000400, 0x00000004, 0x01000404, 0x00010404,
	0x01010404, 0x00010004, 0x01010000, 0x01000404,
	0x01000004, 0x00000404, 0x00010404, 0x01010400,
	0x00000404, 0x01000400, 0x01000400, 0x00000000,
	0x00010004, 0x00010400, 0x00000000, 0x01010004
};

static const unsigned long SB2[64] =
{
	0x80108020, 0x80008000, 0x00008000, 0x00108020,
	0x00100000, 0x00000020, 0x80100020, 0x80008020,
	0x80000020, 0x80108020, 0x80108000, 0x80000000,
	0x80008000, 0x00100000, 0x00000020, 0x80100020,
	0x00108000, 0x00100020, 0x80008020, 0x00000000,
	0x80000000, 0x00008000, 0x00108020, 0x80100000,
	0x00100020, 0x80000020, 0x00000000, 0x00108000,
	0x00008020, 0x80108000, 0x80100000, 0x00008020,
	0x00000000, 0x00108020, 0x80100020, 0x00100000,
	0x80008020, 0x80100000, 0x80108000, 0x00008000,
	0x80100000, 0x80008000, 0x00000020, 0x80108020,
	0x00108020, 0x00000020, 0x00008000, 0x80000000,
	0x00008020, 0x80108000, 0x00100000, 0x80000020,
	0x00100020, 0x80008020, 0x80000020, 0x00100020,
	0x00108000, 0x00000000, 0x80008000, 0x00008020,
	0x80000000, 0x80100020, 0x80108020, 0x00108000
};

static const unsigned long SB3[64] =
{
	0x00000208, 0x08020200, 0x00000000, 0x08020008,
	0x08000200, 0x00000000, 0x00020208, 0x08000200,
	0x00020008, 0x08000008, 0x08000008, 0x00020000,
	0x08020208, 0x00020008, 0x08020000, 0x00000208,
	0x08000000, 0x00000008, 0x08020200, 0x00000200,
	0x00020200, 0x08020000, 0x08020008, 0x00020208,
	0x08000208, 0x00020200, 0x00020000, 0x08000208,
	0x00000008, 0x08020208, 0x00000200, 0x08000000,
	0x08020200, 0x08000000, 0x00020008, 0x00000208,
	0x00020000, 0x08020200, 0x08000200, 0x00000000,
	0x00000200, 0x00020008, 0x08020208, 0x08000200,
	0x08000008, 0x00000200, 0x00000000, 0x08020008,
	0x08000208, 0x00020000, 0x08000000, 0x08020208,
	0x00000008, 0x00020208, 0x00020200, 0x08000008,
	0x08020000, 0x08000208, 0x00000208, 0x08020000,
	0x00020208, 0x00000008, 0x08020008, 0x00020200
};

static const unsigned long SB4[64] =
{
	0x00802001, 0x00002081, 0x00002081, 0x00000080,
	0x00802080, 0x00800081, 0x00800001, 0x00002001,
	0x00000000, 0x00802000, 0x00802000, 0x00802081,
	0x00000081, 0x00000000, 0x00800080, 0x00800001,
	0x00000001, 0x00002000, 0x00800000, 0x00802001,
	0x00000080, 0x00800000, 0x00002001, 0x00002080,
	0x00800081, 0x00000001, 0x00002080, 0x00800080,
	0x00002000, 0x00802080, 0x00802081, 0x00000081,
	0x00800080, 0x00800001, 0x00802000, 0x00802081,
	0x00000081, 0x00000000, 0x00000000, 0x00802000,
	0x00002080, 0x00800080, 0x00800081, 0x00000001,
	0x00802001, 0x00002081, 0x00002081, 0x00000080,
	0x00802081, 0x00000081, 0x00000001, 0x00002000,
	0x00800001, 0x00002001, 0x00802080, 0x00800081,
	0x00002001, 0x00002080, 0x00800000, 0x00802001,
	0x00000080, 0x00800000, 0x00002000, 0x00802080
};

static const unsigned long SB5[64] =
{
	0x00000100, 0x02080100, 0x02080000, 0x42000100,
	0x00080000, 0x00000100, 0x40000000, 0x02080000,
	0x40080100, 0x00080000, 0x02000100, 0x40080100,
	0x42000100, 0x42080000, 0x00080100, 0x40000000,
	0x02000000, 0x40080000, 0x40080000, 0x00000000,
	0x40000100, 0x42080100, 0x42080100, 0x02000100,
	0x42080000, 0x40000100, 0x00000000, 0x42000000,
	0x02080100, 0x02000000, 0x42000000, 0x00080100,
	0x00080000, 0x42000100, 0x00000100, 0x02000000,
	0x40000000, 0x02080000, 0x42000100, 0x40080100,
	0x02000100, 0x40000000, 0x42080000, 0x02080100,
	0x40080100, 0x00000100, 0x02000000, 0x42080000,
	0x42080100, 0x00080100, 0x42000000, 0x42080100,
	0x02080000, 0x00000000, 0x40080000, 0x42000000,
	0x00080100, 0x02000100, 0x40000100, 0x00080000,
	0x00000000, 0x40080000, 0x02080100, 0x40000100
};

static const unsigned long SB6[64] =
{
	0x20000010, 0x20400000, 0x00004000, 0x20404010,
	0x20400000, 0x00000010, 0x20404010, 0x00400000,
	0x20004000, 0x00404010, 0x00400000, 0x20000010,
	0x00400010, 0x20004000, 0x20000000, 0x00004010,
	0x00000000, 0x00400010, 0x20004010, 0x00004000,
	0x00404000, 0x20004010, 0x00000010, 0x20400010,
	0x20400010, 0x00000000, 0x00404010, 0x20404000,
	0x00004010, 0x00404000, 0x20404000, 0x20000000,
	0x20004000, 0x00000010, 0x20400010, 0x00404000,
	0x20404010, 0x00400000, 0x00004010, 0x20000010,
	0x00400000, 0x20004000, 0x20000000, 0x00004010,
	0x20000010, 0x20404010, 0x00404000, 0x20400000,
	0x00404010, 0x20404000, 0x00000000, 0x20400010,
	0x00000010, 0x00004000, 0x20400000, 0x00404010,
	0x00004000, 0x00400010, 0x20004010, 0x00000000,
	0x20404000, 0x20000000, 0x00400010, 0x20004010
};

static const unsigned long SB7[64] =
{
	0x00200000, 0x04200002, 0x04000802, 0x00000000,
	0x00000800, 0x04000802, 0x00200802, 0x04200800,
	0x04200802, 0x00200000, 0x00000000, 0x04000002,
	0x00000002, 0x04000000, 0x04200002, 0x00000802,
	0x04000800, 0x00200802, 0x00200002, 0x04000800,
	0x04000002, 0x04200000, 0x04200800, 0x00200002,
	0x04200000, 0x00000800, 0x00000802, 0x04200802,
	0x00200800, 0x00000002, 0x04000000, 0x00200800,
	0x04000000, 0x00200800, 0x00200000, 0x04000802,
	0x04000802, 0x04200002, 0x04200002, 0x00000002,
	0x00200002, 0x04000000, 0x04000800, 0x00200000,
	0x04200800, 0x00000802, 0x00200802, 0x04200800,
	0x00000802, 0x04000002, 0x04200802, 0x04200000,
	0x00200800, 0x00000000, 0x00000002, 0x04200802,
	0x00000000, 0x00200802, 0x04200000, 0x00000800,
	0x04000002, 0x04000800, 0x00000800, 0x00200002
};

static const unsigned long SB8[64] =
{
	0x10001040, 0x00001000, 0x00040000, 0x10041040,
	0x10000000, 0x10001040, 0x00000040, 0x10000000,
	0x00040040, 0x10040000, 0x10041040, 0x00041000,
	0x10041000, 0x00041040, 0x00001000, 0x00000040,
	0x10040000, 0x10000040, 0x10001000, 0x00001040,
	0x00041000, 0x00040040, 0x10040040, 0x10041000,
	0x00001040, 0x00000000, 0x00000000, 0x10040040,
	0x10000040, 0x10001000, 0x00041040, 0x00040000,
	0x00041040, 0x00040000, 0x10041000, 0x00001000,
	0x00000040, 0x10040040, 0x00001000, 0x00041040,
	0x10001000, 0x00000040, 0x10000040, 0x10040000,
	0x10040040, 0x10000000, 0x00040000, 0x10001040,
	0x00000000, 0x10041040, 0x00040040, 0x10000040,
	0x10040000, 0x10001000, 0x10001040, 0x00000000,
	0x10041040, 0x00041000, 0x00041000, 0x00001040,
	0x00001040, 0x00040040, 0x10000000, 0x10041000
};

/*
* PC1: left and right halves bit-swap
*/
static const unsigned long LHs[16] =
{
	0x00000000, 0x00000001, 0x00000100, 0x00000101,
	0x00010000, 0x00010001, 0x00010100, 0x00010101,
	0x01000000, 0x01000001, 0x01000100, 0x01000101,
	0x01010000, 0x01010001, 0x01010100, 0x01010101
};

static const unsigned long RHs[16] =
{
	0x00000000, 0x01000000, 0x00010000, 0x01010000,
	0x00000100, 0x01000100, 0x00010100, 0x01010100,
	0x00000001, 0x01000001, 0x00010001, 0x01010001,
	0x00000101, 0x01000101, 0x00010101, 0x01010101,
};

/*
* Initial Permutation macro
*/
#define DES_IP(X,Y)                                             \
{                                                               \
	T = ((X >>  4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T <<  4);   \
	T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16);   \
	T = ((Y >>  2) ^ X) & 0x33333333; X ^= T; Y ^= (T <<  2);   \
	T = ((Y >>  8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T <<  8);   \
	Y = ((Y << 1) | (Y >> 31)) & 0xFFFFFFFF;                    \
	T = (X ^ Y) & 0xAAAAAAAA; Y ^= T; X ^= T;                   \
	X = ((X << 1) | (X >> 31)) & 0xFFFFFFFF;                    \
}

/*
* Final Permutation macro
*/
#define DES_FP(X,Y)                                             \
{                                                               \
	X = ((X << 31) | (X >> 1)) & 0xFFFFFFFF;                    \
	T = (X ^ Y) & 0xAAAAAAAA; X ^= T; Y ^= T;                   \
	Y = ((Y << 31) | (Y >> 1)) & 0xFFFFFFFF;                    \
	T = ((Y >>  8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T <<  8);   \
	T = ((Y >>  2) ^ X) & 0x33333333; X ^= T; Y ^= (T <<  2);   \
	T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16);   \
	T = ((X >>  4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T <<  4);   \
}

/*
* DES round macro
*/
#define DES_ROUND(X,Y)                          \
{                                               \
	T = *SK++ ^ X;                              \
	Y ^= SB8[ (T      ) & 0x3F ] ^              \
		 SB6[ (T >>  8) & 0x3F ] ^              \
		 SB4[ (T >> 16) & 0x3F ] ^              \
		 SB2[ (T >> 24) & 0x3F ];               \
	\
	T = *SK++ ^ ((X << 28) | (X >> 4));         \
	Y ^= SB7[ (T      ) & 0x3F ] ^              \
		 SB5[ (T >>  8) & 0x3F ] ^              \
		 SB3[ (T >> 16) & 0x3F ] ^              \
		 SB1[ (T >> 24) & 0x3F ];               \
}

static void des_main_ks( unsigned long SK[32], unsigned char key[8] )
{
	int i;
	unsigned long X, Y, T;
	
	GET_UINT32_BE( X, key, 0 );
	GET_UINT32_BE( Y, key, 4 );
	
	/*
	* Permuted Choice 1
	*/
	T =  ((Y >>  4) ^ X) & 0x0F0F0F0F;  X ^= T; Y ^= (T <<  4);
	T =  ((Y      ) ^ X) & 0x10101010;  X ^= T; Y ^= (T      );
	
	X =   (LHs[ (X      ) & 0xF] << 3) | (LHs[ (X >>  8) & 0xF ] << 2)
	| (LHs[ (X >> 16) & 0xF] << 1) | (LHs[ (X >> 24) & 0xF ]     )
	| (LHs[ (X >>  5) & 0xF] << 7) | (LHs[ (X >> 13) & 0xF ] << 6)
	| (LHs[ (X >> 21) & 0xF] << 5) | (LHs[ (X >> 29) & 0xF ] << 4);
	
	Y =   (RHs[ (Y >>  1) & 0xF] << 3) | (RHs[ (Y >>  9) & 0xF ] << 2)
	| (RHs[ (Y >> 17) & 0xF] << 1) | (RHs[ (Y >> 25) & 0xF ]     )
	| (RHs[ (Y >>  4) & 0xF] << 7) | (RHs[ (Y >> 12) & 0xF ] << 6)
	| (RHs[ (Y >> 20) & 0xF] << 5) | (RHs[ (Y >> 28) & 0xF ] << 4);
	
	X &= 0x0FFFFFFF;
	Y &= 0x0FFFFFFF;
	
	/*
	* calculate subkeys
	*/
	for( i = 0; i < 16; i++ )
	{
		if( i < 2 || i == 8 || i == 15 )
		{
			X = ((X <<  1) | (X >> 27)) & 0x0FFFFFFF;
			Y = ((Y <<  1) | (Y >> 27)) & 0x0FFFFFFF;
		}
		else
		{
			X = ((X <<  2) | (X >> 26)) & 0x0FFFFFFF;
			Y = ((Y <<  2) | (Y >> 26)) & 0x0FFFFFFF;
		}
		
		*SK++ =   ((X <<  4) & 0x24000000) | ((X << 28) & 0x10000000)
				| ((X << 14) & 0x08000000) | ((X << 18) & 0x02080000)
				| ((X <<  6) & 0x01000000) | ((X <<  9) & 0x00200000)
				| ((X >>  1) & 0x00100000) | ((X << 10) & 0x00040000)
				| ((X <<  2) & 0x00020000) | ((X >> 10) & 0x00010000)
				| ((Y >> 13) & 0x00002000) | ((Y >>  4) & 0x00001000)
				| ((Y <<  6) & 0x00000800) | ((Y >>  1) & 0x00000400)
				| ((Y >> 14) & 0x00000200) | ((Y      ) & 0x00000100)
				| ((Y >>  5) & 0x00000020) | ((Y >> 10) & 0x00000010)
				| ((Y >>  3) & 0x00000008) | ((Y >> 18) & 0x00000004)
				| ((Y >> 26) & 0x00000002) | ((Y >> 24) & 0x00000001);
		
		*SK++ =   ((X << 15) & 0x20000000) | ((X << 17) & 0x10000000)
				| ((X << 10) & 0x08000000) | ((X << 22) & 0x04000000)
				| ((X >>  2) & 0x02000000) | ((X <<  1) & 0x01000000)
				| ((X << 16) & 0x00200000) | ((X << 11) & 0x00100000)
				| ((X <<  3) & 0x00080000) | ((X >>  6) & 0x00040000)
				| ((X << 15) & 0x00020000) | ((X >>  4) & 0x00010000)
				| ((Y >>  2) & 0x00002000) | ((Y <<  8) & 0x00001000)
				| ((Y >> 14) & 0x00000808) | ((Y >>  9) & 0x00000400)
				| ((Y      ) & 0x00000200) | ((Y <<  7) & 0x00000100)
				| ((Y >>  7) & 0x00000020) | ((Y >>  3) & 0x00000011)
				| ((Y <<  2) & 0x00000004) | ((Y >> 21) & 0x00000002);
	}
}



/*
* DES key schedule (56-bit)
*/
void des_set_key( des_context *ctx, unsigned char key[8] )
{
	int i;
	
	des_main_ks( ctx->esk, key );
	
	for( i = 0; i < 32; i += 2 )
	{
		ctx->dsk[i    ] = ctx->esk[30 - i];
		ctx->dsk[i + 1] = ctx->esk[31 - i];
	}
}

static void des_crypt( unsigned long SK[32],
					unsigned char input[8],
					unsigned char output[8] )
{
	unsigned long X, Y, T;
	
	GET_UINT32_BE( X, input, 0 );
	GET_UINT32_BE( Y, input, 4 );
	
	DES_IP( X, Y );
	
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	
	DES_FP( Y, X );
	
	PUT_UINT32_BE( Y, output, 0 );
	PUT_UINT32_BE( X, output, 4 );
}

/*
* DES-EBC buffer encryption
*/
void des_ecb_encrypt( des_context *ctx, 
					unsigned char *input,
					unsigned char *output,
					int len )
{
	while( len > 0 )
	{
		des_crypt( ctx->esk, input, output );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}

/*
* DES-EBC buffer decryption
*/
void des_ecb_decrypt( des_context *ctx, 
					unsigned char *input,
					unsigned char *output,
					int len )
{
	while( len > 0 )
	{
		des_crypt( ctx->dsk, input, output );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}

/*
* DES-CBC buffer encryption
*/
void des_cbc_encrypt( des_context *ctx,
					unsigned char iv[8],
					unsigned char *input,
					unsigned char *output,
					int len )
{
	int i;
	UBYTE iv_temp[8] ;
	
	memcpy( iv_temp , iv , 8 ) ;
	
	while( len > 0 )
	{
		for( i = 0; i < 8; i++ )
			output[i] = input[i] ^ iv_temp[i];
		
		des_crypt( ctx->esk, output, output );
		memcpy( iv_temp, output, 8 );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}

/*
* DES-CBC buffer decryption
*/
void des_cbc_decrypt( des_context *ctx,
					unsigned char iv[8],
					unsigned char *input,
					unsigned char *output,
					int len )
{
	int i;
	UBYTE temp[8];
	UBYTE iv_temp[8] ;
	memcpy( iv_temp , iv , 8 ) ;
	
	while( len > 0 )
	{
		memcpy( temp, input, 8 );
		des_crypt( ctx->dsk, input, output );
		
		for( i = 0; i < 8; i++ )
			output[i] = output[i] ^ iv_temp[i];
		
		memcpy( iv_temp, temp, 8 );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}

/*
* Triple-DES key schedule (112-bit)
*/
void des3_set_2keys( des3_context *ctx, unsigned char key[16] )
{
	int i;
	
	des_main_ks( ctx->esk     , key     );
	des_main_ks( ctx->dsk + 32, key + 8 );
	
	for( i = 0; i < 32; i += 2 )
	{
		ctx->dsk[i     ] = ctx->esk[30 - i];
		ctx->dsk[i +  1] = ctx->esk[31 - i];
		
		ctx->esk[i + 32] = ctx->dsk[62 - i];
		ctx->esk[i + 33] = ctx->dsk[63 - i];
		
		ctx->esk[i + 64] = ctx->esk[     i];
		ctx->esk[i + 65] = ctx->esk[ 1 + i];
		
		ctx->dsk[i + 64] = ctx->dsk[     i];
		ctx->dsk[i + 65] = ctx->dsk[ 1 + i];
	}
}

/*
* Triple-DES key schedule (168-bit)
*/
void des3_set_3keys( des3_context *ctx, unsigned char key[24] )
{
	int i;
	
	des_main_ks( ctx->esk     , key      );
	des_main_ks( ctx->dsk + 32, key +  8 );
	des_main_ks( ctx->esk + 64, key + 16 );
	
	for( i = 0; i < 32; i += 2 )
	{
		ctx->dsk[i     ] = ctx->esk[94 - i];
		ctx->dsk[i +  1] = ctx->esk[95 - i];
		
		ctx->esk[i + 32] = ctx->dsk[62 - i];
		ctx->esk[i + 33] = ctx->dsk[63 - i];
		
		ctx->dsk[i + 64] = ctx->esk[30 - i];
		ctx->dsk[i + 65] = ctx->esk[31 - i];
	}
}

static void des3_crypt( unsigned long SK[96],
					unsigned char input[8],
					unsigned char output[8] )
{
	unsigned long X, Y, T;
	
	GET_UINT32_BE( X, input, 0 );
	GET_UINT32_BE( Y, input, 4 );
	
	DES_IP( X, Y );
	
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	DES_ROUND( X, Y );  DES_ROUND( Y, X );
	
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	DES_ROUND( Y, X );  DES_ROUND( X, Y );
	
	DES_FP( Y, X );
	
	PUT_UINT32_BE( Y, output, 0 );
	PUT_UINT32_BE( X, output, 4 );
}

/*
* Triple-DES block encryption (ECB mode)
*/
void des3_ecb_encrypt( des3_context *ctx,
					unsigned char input[8],
					unsigned char output[8],
					int len )
{
	
	while( len > 0 )
	{	
		des3_crypt( ctx->esk, input, output );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}

/*
* Triple-DES block decryption (ECB mode)
*/
void des3_ecb_decrypt( des3_context *ctx,
					unsigned char input[8],
					unsigned char output[8],
					int len )
{
	
	while( len > 0 )
	{
		
		des3_crypt( ctx->dsk, input, output );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}

/*
* 3DES-CBC buffer encryption
*/
void des3_cbc_encrypt( des3_context *ctx,
					unsigned char iv[8],
					unsigned char *input,
					unsigned char *output,
					int len )
{		
	int i;
	UBYTE iv_temp[8] ;
	
	memcpy( iv_temp , iv , 8 ) ;
	
	while( len > 0 )
	{
		for( i = 0; i < 8; i++ )
			output[i] = input[i] ^ iv_temp[i];
		
		des3_crypt( ctx->esk, output, output );
		memcpy( iv_temp, output, 8 );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}

/*
* 3DES-CBC buffer decryption
*/
void des3_cbc_decrypt( des3_context *ctx,
					unsigned char iv[8],
					unsigned char *input,
					unsigned char *output,
					int len )
{	
	int i;
	UBYTE temp[8];
	UBYTE iv_temp[8] ;
	memcpy( iv_temp , iv , 8 ) ;
	
	while( len > 0 )
	{
		memcpy( temp, input, 8 );
		des3_crypt( ctx->dsk, input, output );
		
		for( i = 0; i < 8; i++ )
			output[i] = output[i] ^ iv_temp[i];
		
		memcpy( iv_temp, temp, 8 );
		
		input  += 8;
		output += 8;
		len    -= 8;
	}
}


